Yes, absolutely. 2.4 GHz and 5 GHz use the same types of antennas, so you'd just need to pick a card that has the same number of antenna connectors as the system has antennas built into it, and the same motherboard connector as the card you already have, e.g. mPCI, mPCIe, or M.2. Unfortunately I can't tell you anything about your system because you just said "Dell 3520" without specifying the model line, and there is both an Inspiron 3520 and a Precision 3520.